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Property And Equipment, Net
12 Months Ended
Dec. 31, 2012
Property And Equipment, Net
5. PROPERTY AND EQUIPMENT, NET

Property and equipment consisted of the following at December 31:
 
   
2012
   
2011
 
Furniture and fixtures
  $ 3,916,476     $ 3,381,076  
Equipment
    23,745,101       14,869,677  
Purchased software
    8,706,287       7,142,797  
Leasehold improvements
    1,096,717       1,042,567  
      37,464,581       26,436,117  
Less accumulated depreciation
    (21,439,857 )     (17,583,287 )
Property and equipment, net
  $ 16,024,724     $ 8,852,830  
 
Depreciation expense for the years ended December 31, 2012, 2011, and 2010 was $5.7 million, $4.0 million, and $3.8 million, respectively.